| hanging tough(expression, adjective, mean, hard, determined) |
| intractable(adjective, appearance, tough, firm, violent) |
| irresistible(adjective, strong, expected, necessity, predictable) |
| mulish(adjective, mean, strong, hard, tough) |
| rigorous(adjective, strong, hard, tough, severe) |
| single-minded(adjective, tough, firm, harsh, intense) |
| strong-willed(adjective, determined, resolution, resolute, uncompromising) |
| tough(adjective, mean, strong, hard, firm) |
| unflinching(adjective, mean, severe, harsh, cruel) |
| compulsory(adjective, cruel, obvious, pitiless, necessity) |
| hardheaded(adjective, strong, hard, tough, determined) |
| headstrong(adjective, tough, firm, determined, resolute) |
| hidebound(adjective, determined, resolute, persistent, obstinate) |
| indomitable(adjective, strong, hard, tough, resolution) |
| inelastic(adjective, tough, firm, determined, stiff) |
| ineluctable(adjective, cruel, pitiless, necessary, coming) |
| irrevocable(adjective, expected, necessity, predictable, necessary) |
| pat(adjective, determined, resolute, obstinate, uncompromising) |
| persistent(adjective, tough, determined, unreasonable, grim) |
| sure(adjective, certain, resolute, persistent, obvious) |